Not sure if it's already been said, but if you live in a GS catchment area and don't get in you then attend a secondary modern, not a comprehensive. You can't have a comprehensive school in a a grammar area, unless it is bi-lateral, and is accepting children who have taken the 11+ into the top stream.
I'm in a grammar area and think the system stinks. There are some bright children at secondary moderns, because our grammar schools only take something like the top 2%. The secondary moderns where I live are all "good" schools, but the whole 11+ system leaves me reeling, and I've chosen to send my DC to a comprehensive in the next town to avoid the whole bloody thing. (Also I had the opportunity to move next to an "outstanding" comprehensive, so could have by passed the system that way, but chose not to)
Out of all the DC's who went to grammar school in DS's year , I would say only one went because of his natural ability, rather than being tutored, and one only went because he had been tutored within an inch of his life. But hey if he can keep that up for the next 7 years, he should be OK. And one boy, who really is bright and studious, and of course will get good grades from the secondary modern, didn't get in to the grammar school. His mother was gutted. 
Having said that, I know there are parents who adore grammar schools, and for that reason I would let them remain.
As an additional thought, I once had a BF who had attended a boys grammar school in B'ham. He actually said to me once "Why shouldn't the brightest children have the best education?" At the time I was speechless.
Now I would hold up both my DS's and say "Do you really think one of my children should have a "better" education that the other?"
I could go on, be DC are hungry.